He also pleaded guilty to possessing and accessing child exploitation material.

Christopher John McCoy was ordered to serve 80 per cent of his 10-year jail term behind bars.

McCoy, from Kingsthorpe near Toowoomba, was sentenced to 10 years' jail for his heinous crimes and ordered to serve at least 80 per cent of his sentence behind bars.

He challenged his sentence in the Court of Appeal arguing that he should have been given less time because of his young age, mental illness and prospects for rehabilitation.

But the Court of Appeal upheld the sentence on Friday, ruling that it adequately reflected his "abhorrent behaviour" towards the brothers and his criminal history.

McCoy had breached a suspended sentence for sexual offending and had previously been convicted of sexually abusing two other young boys.

The harrowing details of McCoy's offending were detailed in the Court of Appeal's judgment.

Between December 31 and January 2013, McCoy raped and sexually abused the two brothers, sometimes filming the abuse and offering bribes for sexual acts.

When police interviewed him about the offending, McCoy told officers he liked young boys aged 11-13 and would often trawl through Twitter profiles to try to connect with other people who liked children.

McCoy also told the police he had made contact with a teenage boy in the US who had sent him child exploitation material of other young children.

At his sentence in 2018, Judge Anthony Rafter told McCoy that his offending involved manipulation and grooming and showed a "complete absence of remorse".

The judge said he had corrupted the boys for his own "perverted purposes" to the point where they had become used to his predatory behaviour. - NewsRegional

*For 24-hour sexual violence support call the national hotline 1800RESPECT on 1800 737 732 or MensLine on 1800 600 636.